On Fri, Feb 03, 2023 at 12:55:30PM +0000, Bram Moolenaar wrote: > > On Thu, Feb 02, 2023 at 05:28:03PM +0000, Bram Moolenaar wrote: > > > 3. Add a mechanism to name the members in the call, e.g. > > > var obj = Class.new(line = 5, column = 0) > > > This is similar to 2. but puts it in one line. > > > It requires marking a method to not use positional arguments.a > > > > > > Although 3. looks like a good solution, it requires implementing a new > > > mechanism. And disallowing positional arguments might be considered > > > weird, I cannot think of a language that has this functionality. > > > > Python lets you declare that a function will not accept positional > > arguments: > > > > def fn(*, line, column, also_arg_with_a_default_value=42): > > ... > > > > fn(line=5, column=0) > > fn(column=0, line=5) > > fn(0, 5) # <-- error, positional arguments not allowed > > fn(line=5) # <-- error, 'column' argument is required > > I have been using Python but didn't know about this mechanism.
This syntax was added in Python 3.0. Since I started with Python 2.1, I
still think of it as "the new keyword-only argument syntax". I'm old.
> Apparently the "*" can also appear later, e.g.
>
> def fn(line, *, column, also_arg_with_a_default_value=42):
>
> Now you can use:
> fn(5, column=0)
>
> Although this works, I find it rather obscure.
It is a consequence of allowing variable number of arguments with *args:
def fn(regular, args, *the_rest):
the Python designers decided to allow additional arguments after the
all-consuming varargs argument
def fn(regular, args, *the_rest, keyword_only=None):
and then if you don't actually want the varargs you can omit the name
for it
def fn(regular, args, *, keyword_only=None):
Anyway, I wasn't proposing this syntax for Vimscript, merely mentioning
that there are languages that have this functionality.
Marius Gedminas
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